WO2016158998A1

WO2016158998A1 - Electricity storage element production method and electricity storage element production device

Info

Publication number: WO2016158998A1
Application number: PCT/JP2016/060228
Authority: WO
Inventors: 広和上林; 憲利前田
Original assignee: 株式会社Ｇｓユアサ
Priority date: 2015-03-31
Filing date: 2016-03-29
Publication date: 2016-10-06
Also published as: JP6819574B2; US20180006276A1; CN107431148A; CN107431148B; US10637010B2; DE112016001546T5; JPWO2016158998A1

Abstract

This production method for an electricity storage element (500) where welding is carried out on a container (510) of the electricity storage element (500) comprises: a positioning step (S10) of positioning between two weld sections at which welding is to be carried out, a tool (300) having wall surfaces (A11, A12) formed thereon; and a welding step (S20) of carrying out welding at the two weld sections while supplying a shielding gas to the two weld sections from two different directions respectively facing the two weld sections.

Description

Storage element manufacturing method and storage element manufacturing apparatus

The present invention relates to a method for manufacturing a power storage element and a device for manufacturing a power storage element.

Conventionally, it has been known to form a container by performing laser beam welding on a container of a storage element in the manufacture of the storage element. In laser welding in which welding is performed using a laser beam, an inert gas called a shield gas is supplied to the welding target portion in order to suppress oxidation due to the metal in the welding target portion (welding location) coming into contact with the outside air. The part to be welded is shielded from air. Thus, a laser welding apparatus is disclosed that supplies a shielding gas from two directions on both sides of a welding target portion toward the welding target portion so that the entire welding target portion to be welded has a shielding gas atmosphere. (For example, refer to Patent Document 1).

JP 2010-105041 A

However, the conventional laser welding apparatus may cause poor welding.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a storage element that can reduce the occurrence of poor welding.

In order to achieve the above object, a method for manufacturing a power storage element according to one aspect of the present invention is a method for manufacturing a power storage element that performs welding on a container of a power storage element. An arrangement step of arranging a jig having a wall surface formed between the portions, and supplying the shielding gas from the two different directions to the two welding target portions, corresponding to the two welding target portions, Welding steps for welding two parts to be welded.

According to this, the flow direction of the shield gas supplied from two different directions toward the two welding target portions is changed by the jig after passing through the vicinity of each welding target portion. Specifically, it goes in the direction away from the container. That is, by arranging the jig between the two welding target portions, the two flows of the shielding gas are suppressed from joining at the two welding target portions. For this reason, generation | occurrence | production of the turbulent flow by shield gas in two welding object parts can be reduced, and the atmosphere of stable shield gas can be formed in two welding object parts. Therefore, the occurrence of poor welding can be reduced.

According to the method for manufacturing a power storage element of the present invention, a stable shield gas atmosphere can be formed in the welding target portion, and the occurrence of poor welding can be reduced.

FIG. 1 is a diagram illustrating an external appearance of a power storage device manufacturing apparatus according to the present embodiment. FIG. 2 is a diagram for explaining the arrangement of jigs in the method for manufacturing the energy storage device according to the present embodiment. FIG. 3 is a view for explaining a welding path of the container of the electricity storage device according to the present embodiment. FIG. 4 is a perspective view showing an external appearance of the energy storage device according to the embodiment. FIG. 5A is a perspective view when the jig according to the embodiment is viewed from the upper oblique direction. FIG. 5B is a perspective view when the jig according to the embodiment is viewed from a lower oblique direction. 6 is an enlarged view of a part around the jig in the VI-VI sectional view of the manufacturing apparatus in FIG. 1 according to the embodiment. FIG. 7 is a flowchart showing a method for manufacturing the energy storage device according to the embodiment. FIG. 8 is a diagram showing an external appearance of a storage device manufacturing apparatus according to a modification. FIG. 9 is an enlarged view of a part around the jig in the IX-IX sectional view of the manufacturing apparatus in FIG. FIG. 10 is an enlarged view of a part around the jig in the XX sectional view of the manufacturing apparatus in FIG. FIG. 11 is a perspective view showing an appearance of a state in which the jig according to the modification is disposed at a predetermined position of the power storage element.

The conventional laser welding apparatus may cause poor welding.

That is, in the conventional laser welding apparatus, there is a possibility that turbulent flow may occur in the vicinity of the welding target portion due to collision of the shielding gases flowing into the welding target portion from two different directions. For this reason, it is difficult to form a stable shield gas atmosphere in the welding target portion, and as a result, there is a risk of causing poor welding.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a storage element that can reduce the occurrence of poor welding by forming a stable shielding gas atmosphere. And

Further, in the welding step, the shield gas supplied to the welding target portion may flow along an inclined surface that is at least a part of the wall surface.

For this reason, each of the two flows of the shield gas supplied from two different directions can be easily flown along the wall surface of the jig. Therefore, the direction in which each of the two flows of shield gas flows can be changed so that turbulent flow does not occur. Thereby, the atmosphere of the stable shield gas can be formed in two welding object parts, and generation | occurrence | production of a welding defect can be reduced.

In the placement step, the jig may be placed in contact with the container.

For this reason, it can suppress that two flow of the shield gas supplied from two directions joins in two welding object parts. Moreover, since the heat generated in the container by welding can be conducted to the jig, the two parts to be welded can be cooled.

Further, a cooling step for cooling the jig may be included.

For this reason, the heat generated by welding, which is thermally conducted to the jig, can be released, and the high temperature can be suppressed by repeatedly using the jig. Thereby, when welding the container of an electrical storage element, it can suppress that a high temperature jig | tool contacts a container and exerts a bad influence on an electrical storage element. Moreover, since it can suppress that a jig | tool deteriorates with a temperature change, the lifetime of a jig | tool can be extended.

Further, in the welding step, the two welding target portions may be welded by irradiating a laser beam from a predetermined position toward the two welding target portions while changing an irradiation angle.

For this reason, even when the two welding target portions are welded by scanning with a laser beam, a stable shield gas atmosphere can be formed in the two welding target portions.

An electrical storage element manufacturing apparatus according to an aspect of the present invention is an electrical storage element manufacturing apparatus for performing welding on an electrical storage element container, and includes two welding target portions to be welded. A jig having a wall surface disposed between the two welding target portions to which shield gas is supplied from two different directions is provided.

According to this, the flow direction of the shield gas supplied from two different directions toward the two welding target portions is changed by the jig after passing through the vicinity of each welding target portion. Specifically, it goes in the direction away from the container. That is, by arranging the jig between the two welding target portions, the two flows of the shielding gas are suppressed from joining at the two welding target portions. For this reason, generation | occurrence | production of the turbulent flow by shield gas in two welding object parts can be reduced, and the atmosphere of stable shield gas can be formed in two welding object parts. Therefore, when welding is performed, the occurrence of poor welding can be reduced.

Furthermore, two blowout ports that supply shield gas from the two different directions may be provided in the two welding target portions.

According to this, the shielding gas can be easily supplied to the two welding target portions.

Further, at least a part of the wall surface may be inclined with respect to the direction in which the shield gas flows.

Thus, the direction of the flow can be changed by causing each of the two flows of shield gas supplied from two different directions along the inclined surface of the jig. Therefore, the direction in which the shield gas flows can be changed so that turbulent flow does not occur. Thereby, the atmosphere of the stable shield gas can be formed in two welding object parts, and generation | occurrence | production of a welding defect can be reduced.

Further, the container includes a main body having a rectangular opening and a long plate-like lid that closes the opening, and the two welding target portions are formed in a rectangular annular shape between the main body and the lid. Two long side portions facing each other in the boundary portion, the jig is disposed between the two long side portions, and at least a part of the wall surface is in a direction in which the shield gas flows. Further, the shield gas may be inclined so as to move away from the container toward the downstream side in the flow direction.

According to this, in the two opposing portions of the rectangular ring-shaped boundary portion between the main body and the lid, which are the parts to be welded, the distance between each other is short and the two welding distances are long portions. Since a jig is disposed between the long side portions, it is possible to suppress the joining of shield gases supplied from two different directions. Moreover, since the direction in which the shield gas flows can be changed to a direction away from the container, it is possible to suppress the shield gas supplied from two different directions from joining in the welding target portion of the container.

Hereinafter, a method for manufacturing a power storage element and a device for manufacturing a power storage element according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

(Embodiment)
First, the manufacturing apparatus 10 for the power storage element 500 will be described.

FIG. 1 is a diagram showing an external appearance of a storage element manufacturing apparatus according to an embodiment. FIG. 2 is a view for explaining a jig and a plurality of fixing portions according to the embodiment. In these figures and the following figures, for convenience of explanation, the Z-axis direction is shown as the vertical direction, and in the following, the Z-axis direction is the vertical direction (that is, the Z-axis direction plus side is upward, the Z-axis direction is Although there is a portion that is described as the minus side below), in the actual usage, the Z-axis direction is not always the vertical direction.

As shown in the figure, manufacturing apparatus 10 for power storage element 500 includes welded portion 100, a plurality (four in this embodiment) of blowing portions 210 to 240, a jig 300, and a plurality of (this embodiment). 4) fixing portions 410 to 440. In the present embodiment, manufacturing apparatus 10 is an apparatus for welding main body 511 and lid 512 of container 510 of power storage element 500. That is, in the present embodiment, the weld target portion 530 to be welded of the container 510 of the power storage element 500 is a boundary portion between the main body 511 and the lid body 512.

The welding unit 100 is a laser unit that welds the container of the electricity storage element 500 by irradiating the laser beam L1 (L2). Specifically, the welded portion 100 welds the welding target portion by irradiating the laser beam while changing the irradiation angle from a predetermined position P1 (above) toward the welding target portion of the container. For example, the welding part 100 welds a part of welding object part with the angle of the laser beam L1, and then welds another part of welding object part with the angle of the laser beam L2. For example, the welding unit 100 includes a scanner unit (for example, a galvano scanner unit) that scans by changing the angle of the laser beam emitted from the welding unit 100 by reflecting the laser beam to a mirror that can change the angle. Have.

Here, the welding path performed by the welded portion 100 will be described with reference to FIG. FIG. 3 is a view for explaining a welding path of the container of the electricity storage device according to the present embodiment.

In the present embodiment, as shown in FIG. 3, the welded portion 100 performs welding in the order of, for example, a long side portion 531, a short side portion 533, a long side portion 532, and a short side portion 534. . That is, the welded portion 100 performs welding on the container 510 by scanning the rectangular annular welding target portion 530 while changing the angle of the laser beam by one continuous laser beam irradiation.

The plurality of blowing units 210 to 240 supply the shield gas toward the welding target portion 530 of the container 510 of the storage element 500. The plurality of blow-out portions 210 to 240 supply shield gas from both sides in the X-axis direction and both sides in the Y-axis direction to the upper surface of the container 510 where the welding target portion 530 is formed. Specifically, the two

outlets

210 and 220 are disposed on both sides of the container 510 in the Y-axis direction, and supply shield gas from both sides in the Y-axis direction toward the welding target portion 530 on the upper surface of the container 510. In addition, the two

outlets

230 and 240 are arranged on both sides of the container 510 in the X-axis direction, and supply shield gas from both sides in the X-axis direction toward the welding target portion 530 on the upper surface of the container 510. The shield gas is not particularly limited as long as it is an inert gas that can suppress oxidation due to the metal at the welded portion coming into contact with the outside air, and examples thereof include N 2 gas, Ar gas, and He gas.

Each of the plurality of outlets 210 to 240 has

introduction ports

211, 221, 231, and 241 through which shield gas is introduced, and

outlets

212, 222, 232, and 242 that blow out the shield gas toward the welding target portion 530. Have. Each of the plurality of outlets 210 to 240 rectifies the shield gas while the gas Gin introduced from the

inlets

211, 221, 231, and 241 flows through the flow paths to the

outlets

212, 222, 232, and 242. It also has a function as a rectifier. That is, the gas Gout blown by the plurality of blowing units 210 to 240 is a gas that is rectified by the plurality of blowing units 210 to 240 and has reduced turbulent flow.

Here, the details of the configuration of the storage element 500 to be welded will be described with reference to FIG. FIG. 4 is a perspective view showing an external appearance of the energy storage device according to the embodiment.

The storage element 500 is a secondary battery that can charge and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. For example, the power storage element 500 is applied to an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), a hybrid electric vehicle (HEV), or the like. In addition, the electrical storage element 500 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

As illustrated in FIG. 4, the power storage element 500 includes a container 510 including a main body 511 having a rectangular cylindrical shape and a bottom, and a lid 512 that is a plate-like member that closes an opening of the main body 511, and a positive electrode terminal 521. And a negative electrode terminal 522. In the lid 512, the plate-like outer edge portion of the lid 512 faces the inner wall surface of the opening of the main body 511 in a state where the opening of the main body 511 is closed. The opening of the main body 511 is provided with a stepped portion 511a (see FIG. 6) that supports the lower surface of the lid body 512, and the upper end of the main body 511 and the upper surface of the lid body 512 are at the same position (level). It is comprised so that it may become. That is, the welding target portion 530 is formed on the upper surface of the container 510.

This container 510 is capable of sealing the inside by accommodating the electrode body and the like and then welding the lid body 512 and the main body 511. The material of the lid 512 and the main body 511 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

Further, the positive terminal 521 and the negative terminal 522 are attached to the lid 512. The positive terminal 521 and the negative terminal 522 are formed to protrude upward from the upper surface of the lid 512. The positive electrode terminal 521 and the negative electrode terminal 522 are electrode terminals that are electrically connected to each electrode of an electrode body (not shown) and output electric power stored inside or store electric power from outside. is there.

In the present embodiment, power storage element 500 has a long plate shape in which lid body 512 of container 510 has two long sides parallel to the X-axis direction and two short sides parallel to the Y-axis direction. It is a member. Therefore, as shown in FIG. 3, the welding target portion 530 of the container 510 has two

long side portions

531 and 532 parallel to the X-axis direction and the Y-axis, similar to the outer shape when the lid 512 is viewed from above. It is a rectangular annular portion having two

short side portions

533 and 534 parallel to the direction.

Here, the blowout part 210 has the blower outlet 212 which faces the long side part 531 and has a width longer than the length of the long side part 531. Similarly, the blowout part 220 has a blower outlet 222 that faces the long side portion 532 and has a width longer than the length of the long side portion 532. In short, the two

outlets

210 and 220 supply the shielding gas from two different directions to the two

long side portions

531 and 532 parallel to the X-axis direction of the welding target portion 530, and the two long side portions. Shield gas is supplied over the whole of 531 and 532. Moreover, the two blowing

parts

210 and 220 supply shield gas at substantially the same timing.

Furthermore, the blowout part 230 has the blower outlet 232 which faces the short side part 533 and has a width longer than the length of the short side part 533. Similarly, the blowing part 240 has a blower outlet 242 that faces the short side portion 534 and has a width longer than the length of the short side portion 534. As a result, the two blowing

portions

230 and 240 supply the shielding gas toward each of the two

short side portions

533 and 534 parallel to the Y-axis direction of the welding target portion 530, and the two short side portions 533. 534 is supplied with shielding gas throughout. Moreover, the two blowing

parts

230 and 240 supply shield gas at substantially the same timing.

Also, the two

outlets

210 and 220 and the two

outlets

230 and 240 supply shield gas at substantially the same timing. That is, the four

outlets

210, 220, 230, and 240 supply shield gas at substantially the same timing and during substantially the same period.

The jig 300 is a jig for preventing the shielding gas supplied from a plurality of different directions from colliding with each other. As shown in FIG. 2, the jig 300 is disposed at a predetermined position P <b> 2 on the upper surface of the container 510 of the power storage element 500 before welding by the welded portion 100 is performed. Here, the predetermined position P2 is a position between two welding target parts (in this embodiment, two long side parts 531 and 532) to which shield gas is supplied from two different directions. In addition, as shown in FIG. 3, the jig 300 has wall surfaces A11 and A12 facing the two

long side portions

531 and 532 in a state where the jig 300 is disposed at a predetermined position P2. That is, the wall surfaces A11 and A12 are wall surfaces for shielding the shielding gas. The material of the jig 300 is not particularly limited, but since the heat generated by welding can be dissipated, it is preferably a member having thermal conductivity. The material of the jig 300 is preferably a member having heat resistance that can withstand the heat generated by welding. The jig 300 is preferably a metal such as aluminum, an aluminum alloy, copper, or a copper alloy.

The plurality of fixing portions 410 to 440 are jigs for positioning the electric storage element 500 with respect to the welding portion 100. Specifically, as shown in FIG. 2, the two fixing

portions

410 and 420 face each other in the Y-axis direction, and sandwich the long side surface of the container 510 of the storage element 500 from both sides in the Y-axis direction. The power storage element 500 is fixed at a predetermined position in the Y-axis direction. The two fixing

portions

430 and 440 are opposed to each other in the X-axis direction, and the power is stored at a predetermined position in the X-axis direction by sandwiching the short side surface of the container 510 of the power storage element 500 from both sides in the X-axis direction. It fixes so that the element 500 may be located. Note that the position of the electricity storage element 500 in the Z-axis direction is determined by placing the electricity storage element 500 on a pedestal (not shown). As described above, the power storage element 500 is fixed in a state where it is positioned at predetermined positions in the X-axis direction, the Y-axis direction, and the Z-axis direction by the plurality of fixing portions 410 to 440. Even if it replaces and fixes to this electrical storage element 500, the positional relationship of another electrical storage element 500 and the welding part 100 can be made into a fixed relationship.

Here, the configuration of the jig 300 will be described in detail with reference to FIGS. 5A and 5B.

FIG. 5A is a perspective view when the jig according to the embodiment is viewed from the upper oblique direction. FIG. 5B is a perspective view when the jig according to the embodiment is viewed from a lower oblique direction.

As shown in these drawings, the jig 300 has a base portion 310 on the negative side in the Z-axis direction and a wall portion 320 protruding from the base portion 310 toward the positive side in the Z-axis direction. The base 310 is a part for being arranged on the upper surface of the container 510. In the present embodiment, base 310 has a side surface facing in the Y-axis direction, but may not have a side surface. The wall part 320 has wall surfaces A11 and A12. The outer shape of the jig 300 may be any shape that does not block the irradiation of the laser beam to the welding target portion when the jig 300 is disposed in the container 510 and the container 510 is welded with the laser beam. .

Further, as shown in FIG. 5B, the jig 300 has a groove 330 formed on the lower surface of the base 310. The groove 330 has a shape for arranging the jig 300 without interfering with the positive electrode terminal 521 and the negative electrode terminal 522 when the jig 300 is arranged on the upper surface of the power storage element 500. Accordingly, since the positive electrode terminal 521 and the negative electrode terminal 522 can be accommodated inside the groove portion 330 of the base portion 310 of the jig 300, the jig is placed with the lower surface of the jig 300 in contact with the upper surface of the container 510. 300 can be arranged at a predetermined position P2 of the container 510. As described above, since the positive electrode terminal 521 and the negative electrode terminal 522 can be accommodated inside the jig 300, it is possible to suppress the shield gas from hitting the positive electrode terminal 521 and the negative electrode terminal 522, and the flow of the shield gas is disturbed. Generation of flow can be reduced.

The groove portion 330 has side surfaces on both sides in the X axis direction of the positive electrode terminal 521 and the negative electrode terminal 522 (a side surface on the negative side in the X axis direction of the positive electrode terminal 521 and a side surface on the positive side in the X axis direction of the negative electrode terminal 522). The size is preferably such that the jig 300 can be positioned in the X-axis direction and the Y-axis direction by contacting the side surfaces on both sides in the axial direction. In this case, the size of the groove 330 may be such that a predetermined gap is generated between the side surfaces on both sides in the X-axis direction and the side surfaces on both sides in the Y-axis direction of the positive electrode terminal 521 and the negative electrode terminal 522. . Moreover, the depth of the groove part 330 should just be larger than the height of the positive electrode terminal 521 and the negative electrode terminal 522. FIG. In FIG. 6 described later, the predetermined gap is not shown. As described above, the groove 330 is formed in such a size that the jig 300 is not in contact with the positive electrode terminal 521 and the negative electrode terminal 522 in a state where the jig 300 is disposed at the predetermined position P2 of the container 510, so that the heat of laser welding is increased. And transmission to the negative terminal 522 can be suppressed.

Note that when measures are taken to prevent the heat of laser welding from being transmitted, the jig 300 may be in contact with the positive terminal 521 and the negative terminal 522. The measure for preventing the heat of laser welding from being transmitted is, for example, a heat insulating material between the groove portion 330 of the jig 300 and the positive terminal 521 and the negative terminal 522 in a state where the jig 300 is disposed at the predetermined position P2 of the container 510. It is to provide. That is, the jig 300 may have a heat insulating material provided along the surface of the groove 330.

Next, with reference to FIG. 6, the flow of the shielding gas when the shielding gas is supplied from the plurality of blowing portions 210 to 240 in a state where the jig 300 is disposed at the predetermined position P2 of the container 510 of the storage element 500 will be described. explain.

FIG. 6 is an enlarged view of a part around the jig in the VI-VI sectional view of the manufacturing apparatus in FIG. 1 according to the embodiment.

As shown in FIG. 6, the two blow-out

portions

210 and 220 that are arranged to face each other in the Y-axis direction have shield gas directed toward the welding target portion 530 while sandwiching the welding target portion 530 in the Y-axis direction. Supply. That is, the two blowing

parts

210 and 220 supply shield gas from two different directions toward two welding target parts. Specifically, the blow-out portion 210 disposed on the negative side in the Y-axis direction of the energy storage device 500 supplies the shielding gas toward the long side portion 531 that is a part of the welding target portion 530 on the negative side in the Y-axis direction. Supply. Further, the blow-out portion 220 disposed on the Y axis direction plus side of the power storage element 500 supplies a shielding gas toward the long side portion 532 that is a part on the Y axis direction plus side of the welding target portion 530.

Also, the two blow-out

portions

210 and 220 supply a shielding gas to a space at a predetermined interval from the upper surface of the container 510 of the power storage element 500 where the welding target portion 530 is formed. Specifically, the two

outlets

210 and 220 are arranged such that the lower ends of the

outlets

212 and 222 for blowing out the shielding gas are at the same height as the upper surface of the container 510. In general, the flow of gas blown out from the opening diffuses in the width direction of the flow, so that the flow has a width larger than the size of the opening. That is, by arranging the lower ends of the

air outlets

212 and 222, which are openings, so as to be the same height as the upper surface of the container 510, the shield gas flows while reliably contacting the upper surface of the container 510. .

In addition, the above-mentioned thing demonstrated using FIG. 6 can be said similarly with respect to the two blowing

parts

230 and 240 arrange | positioned facing the X-axis direction.

Here, the flow F11 of the shielding gas supplied by the blow-out part 210 hits the wall surface A11 of the wall part 320 of the jig 300 after passing over the long side part 531. Accordingly, the flow direction of the shield gas flow F11 that has flowed along the horizontal direction (Y-axis direction) is changed along the wall surface A11 and is directed upward (Z-axis direction plus side). Similarly, the flow F12 of the shield gas supplied by the blow-out part 220 hits the wall surface A12 of the wall part 320 of the jig 300 after passing over the long side part 532. Accordingly, the flow direction of the shield gas flow F12 flowing along the horizontal direction (Y-axis direction) is changed along the wall surface A12 and is directed upward (Z-axis direction plus side).

That is, the shield gas blown out from the blow-out

portions

210 and 220 flows with the jig 300 changing the flow direction by a predetermined angle (90 degrees in the present embodiment). As a result, the shielding gas flows along the surface of the jig 300 to at least the end of the jig 300 on the plus side in the Z-axis direction.

Shield gas blown from two different directions flows in the same direction (Z-axis direction plus side) by changing the flow direction by the jig 300. In this way, since the jig 300 can align the flow directions of the shield gas blown from two different directions, turbulent flow is generated when the shield gas blown from the two different directions collides with each other. Can be effectively suppressed.

Here, as shown in FIG. 6, the wall portion 320 of the jig 300 is formed so that the interval between the wall surface A11 and the wall surface A12 becomes shorter toward the plus side in the Z-axis direction. That is, part of the wall surfaces A11 and A12 is inclined with respect to the Y-axis direction in which the shield gas flows. Specifically, a part of the wall surfaces A11 and A12 is inclined with respect to the direction in which the shield gas flows so as to move away from the lid 512 toward the downstream side in the direction in which the shield gas flows.

In the present embodiment, the wall surface A11 and the wall surface A12 are formed such that the portion on the plus side in the Z-axis direction is more steeply set than the portion on the minus side in the Z-axis direction. The portion is formed so as to be substantially orthogonal to the lid 512. That is, it can be said that the inclined surface is a curved curved surface and is curved so as to be convex inside the wall surface A11 and the wall surface A12.

In addition, the jig 300 is arranged at a predetermined position P2 of the container 510, and the height from the upper surface of the container 510 is the height of the

outlets

212, 222, 232, 242 of the plurality of outlets 210-240. This is a higher configuration. Thereby, it can suppress that the shielding gas blown out from the

blower outlets

212, 222, 232, 242 collides with the welding target portion 530.

Next, a method for manufacturing a power storage device using the jig 300 configured as described above will be described with reference to FIG. FIG. 7 is a flowchart showing a method for manufacturing the energy storage device according to the embodiment. In the method for manufacturing power storage element 500, it is assumed that power storage element 500 is already positioned by a plurality of fixing portions 410 to 440.

First, the jig 300 is arranged at a predetermined position P2 on the upper surface of the container 510 of the electricity storage element 500 (S10: arrangement step). Specifically, the jig 300 in which the wall surfaces A11 and A12 are formed is disposed between the two

long side portions

531 and 532 to which the container 510 is welded. In the placement step S10, the jig 300 is preferably placed in contact with the two

long side portions

531 and 532. In addition, arrangement | positioning step S10 may be performed by the manufacturing apparatus 10, and an operator (person) may perform it. For example, if the manufacturing apparatus 10 has a mechanism for moving the jig 300 to the predetermined position P2 of the container 510, the manufacturing apparatus 10 may perform the arrangement step S10.

Next, the welding target portion 530 is welded while supplying the shielding gas toward the welding target portion 530 (S20: welding step). Specifically, the shielding gas is directed toward the two

long side portions

531 and 532 and the two

short side portions

533 and 534 of the welding target portion 530 from four different directions by the plurality of blowing portions 210 to 240, respectively. Supply. In the welding step S20, the shield gas supplied to the welding target portion flows along the inclined surface by hitting the inclined surface (curved surface) of the jig 300. And the welding part 100 welds the welding object part 530 in the state by which shield gas was supplied.

As described above, according to the method for manufacturing power storage device 500 according to the embodiment of the present invention, jig 300 having a wall surface formed between two

long side portions

531 and 532 to be welded is disposed. The two

long side portions

531 and 532 are welded while supplying the shielding gas to the two

long side portions

531 and 532 from two different directions.

That is, the shield gas flows F11 and F12 supplied from the two different directions toward the two long-

side portions

531 and 532 pass through the long-

side portions

531 and 532 and then pass through the respective wall surfaces of the jig 300. The flowing direction is changed by A11 and A12. Specifically, the direction is away from the container 510. That is, by arranging the jig 300 between the two

long side portions

531 and 532, the two flows F11 and F12 of the shielding gas are suppressed from joining at the two

long side portions

531 and 532. . For this reason, the occurrence of turbulent flow due to the shield gas in the two

long side portions

531 and 532 can be reduced, and a stable shield gas atmosphere can be formed in the two

long side portions

531 and 532. Therefore, the occurrence of poor welding can be reduced.

Further, in the welding step S20, the shield gas supplied to the welding target portion 530 flows along an inclined surface that is a part of the wall surfaces A11 and A12 of the jig 300. Therefore, each of the two flows F11 and F12 of the shield gas supplied from two different directions can be easily flown along the wall surfaces A11 and A12 of the jig 300. Therefore, the direction in which each of the two flows F11 and F12 of the shield gas flows can be changed so that turbulent flow does not occur. Thereby, a stable shield gas atmosphere can be formed in the two

long side portions

531 and 532, and the occurrence of poor welding can be reduced.

Also, in the arrangement step S10, the jig 300 is arranged in contact with the container 510. For this reason, it can suppress that the two flows F11 and F12 of the shield gas supplied from two directions merge in the two

long side parts

531 and 532. Moreover, since the heat generated in the container 510 by welding can be conducted to the jig 300, the two welding target portions can be cooled.

Also, in the welding step S20, the two

long side portions

531 and 532 are welded by irradiating the laser beam L1 from the predetermined position toward the two

long side portions

531 and 532 while changing the irradiation angle.

Conventionally, when a torch or a workpiece moves, a gas nozzle that blows out shield gas is attached to a laser head or the like, so that the gas nozzle follows the laser beam and supplies the shield gas to the welded part. . In recent years, laser welding is not performed by moving a torch or a workpiece, but, for example, welding by a galvano scanner has become the mainstream. In the case of welding by a galvano scanner, a laser beam is irradiated by the operation of a mirror mounted inside. In this case, since it is difficult to move the gas nozzle following the laser beam, it is necessary to supply a shielding gas from around the workpiece.

However, when shielding gas is supplied from around the workpiece, the supplied shielding gases collide with each other and the gas flow is turbulent. There was an adverse effect on welding quality. As described above, even if the two

long side portions

531 and 532 are welding by scanning with the laser beam L1 and the shield gas is supplied from two different directions, the two

long side portions

531 and 532 Since the jig 300 is disposed between the two

long side portions

531, 532, a stable shield gas atmosphere can be formed.

Also, the two

long side portions

531 and 532 are provided with two

outlets

212 and 222 for supplying shield gas from two different directions. According to this, the shield gas can be easily supplied to the two

long side portions

531 and 532.

Moreover, a part of wall surface A11, A12 inclines with respect to the direction where shield gas flows. In this way, the flow of the shield gas supplied from two different directions is changed along the inclined surface of the jig 300 to change the direction of the flow. The generation of turbulent flow caused by hitting can be reduced. Thereby, a stable shield gas atmosphere can be formed in the two

long side portions

531 and 532, and the occurrence of poor welding can be reduced.

Further, the container 510 includes a main body 511 having a rectangular opening and a long plate-like lid body 512 that closes the opening, and the two welding target portions are rectangular annular shapes of the main body 511 and the lid body 512. Two long-

side portions

531 and 532 facing each other in the boundary portion (welding target portion 530), and the jig 300 is disposed between the two long-

side portions

531 and 532. That is, in the two opposing portions of the rectangular annular boundary portion between the main body 511 and the lid body 512 that are the welding target portions 530, the distance between each other is short and the two welding distances are long portions. Since a jig is disposed between the

long side portions

531 and 532, it is possible to suppress the joining of shield gases supplied from two different directions.

Further, part of the wall surfaces A11 and A12 is inclined with respect to the direction in which the shield gas flows so as to move away from the container 510 toward the downstream side in the direction in which the shield gas flows. That is, since the direction in which the shield gas flows can be changed to a direction away from the container 510, the shield gas supplied from two different directions is prevented from joining in the two

long side portions

531 and 532 of the container 510. it can.

As mentioned above, although the manufacturing method of the electrical storage element 500 which concerns on embodiment of this invention, and the manufacturing apparatus 10 of the electrical storage element 500 were demonstrated, this invention is not limited to the said embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

For example, in the above embodiment, the jig 300 having the wall surfaces A11 and A12 including the surface inclined with respect to the Y-axis direction is employed, but not limited thereto, as shown in FIGS. A jig 300a having wall surfaces A23 and A24 including surfaces inclined with respect to the X-axis direction may be employed as the wall surfaces A21 and A22 including surfaces inclined with respect to the Y-axis direction.

FIG. 8 is a diagram showing an external appearance of a storage element manufacturing apparatus according to a modification. FIG. 9 is an enlarged view of a part around the jig in the IX-IX sectional view of the manufacturing apparatus in FIG. FIG. 10 is an enlarged view of a part around the jig in the XX sectional view of the manufacturing apparatus in FIG. Since the configuration other than the jig 300a of the manufacturing apparatus 10a in FIG. 8 is the same as the configuration other than the jig 300 of the manufacturing apparatus 10 described above, the same reference numerals are given and the description is omitted.

As shown in FIG. 9, the jig 300a is formed so that the interval between the wall surface A21 and the wall surface A22 becomes shorter toward the plus side in the Z-axis direction. That is, the jig 300a has a surface inclined with respect to the Y-axis direction in which the shield gas flows. As shown in FIG. 10, the jig 300a is formed so that the interval between the wall surface A23 and the wall surface A24 becomes shorter toward the Z axis plus side. That is, the jig 300a has a surface inclined with respect to the X-axis direction through which the shield gas flows.

When the jig 300a having such an external shape is used, the shield gas supplied from four directions to the welding target portion 530 flows as shown in FIGS.

As shown in FIG. 9, the flow F21 of the shield gas supplied by the blow-out part 210 hits the wall surface A21 of the jig 300a after passing over the long side portion 531. Thus, the flow direction of the shield gas flow F21 flowing along the horizontal direction (Y-axis direction) is changed along the wall surface A21 and is directed upward (Z-axis direction plus side). Similarly, the shield gas flow F <b> 22 supplied by the blow-out unit 220 hits the wall surface A <b> 22 of the jig 300 a after passing over the long side portion 532. Thereby, the flow direction of the shield gas flow F22 flowing along the horizontal direction (Y-axis direction) is changed along the wall surface A22, and is directed upward (Z-axis direction plus side).

Further, as shown in FIG. 10, the flow F23 of the shield gas supplied by the blowing unit 230 hits the wall surface A23 of the jig 300a after passing over the short side portion 533. As a result, the shield gas flow F23 flowing along the horizontal direction (X-axis direction) is directed upward (Z-axis direction plus side) along the wall surface A23. Similarly, the flow F24 of the shielding gas supplied by the blowing part 240 hits the wall surface A24 of the jig 300a after passing over the short side portion 534. As a result, the shield gas flow F24 flowing along the horizontal direction (X-axis direction) is directed upward (Z-axis direction plus side) along the wall surface A24.

That is, the shielding gas blown out from the blowing

portions

210, 220, 230, and 240 flows with the jig 300a changing the flowing direction by a predetermined angle (90 degrees in the present embodiment). As a result, the shield gas flows along the surface of the jig 300a to at least the end of the jig 300a on the plus side in the Z-axis direction.

Shield gas blown from four different directions flows in the same direction (Z-axis direction plus side) by changing the flow direction by the jig 300a. Thus, since the jig 300a can align the flow directions of the shield gas blown from four different directions, the shield gas blown from the four different directions collides to generate turbulent flow. Can be effectively suppressed.

As described above, by using the jig 300a having the wall surfaces A21 to A24 opposed to the four different directions, the flow of the shield gas supplied from the four different directions can be directed upward. For this reason, it can suppress that shield gas joins in the welding object part 530, and can reduce that a turbulent flow generate | occur | produces in a welding object part.

In addition, although the method for manufacturing the energy storage device according to the above-described embodiment is configured by two steps of the placement step S10 and the welding step S20, it may further include a cooling step for cooling the

jigs

300 and 300a. For example, the heat transfer characteristics may be improved by providing irregularities on the wall surface in the Y-axis direction of the jig so that heat exchange with the shielding gas is further performed, and the jig may be cooled by the shielding gas. . Specifically, a jig having improved heat transfer characteristics by providing a groove along the direction in which the shield gas flows may be employed. Moreover, when there exists a site | part holding a jig | tool in a manufacturing apparatus, you may cool a jig | tool by flowing refrigerant | coolants, such as water, in the site | part holding a jig | tool. Further, for example, a flow path for flowing a coolant such as water may be formed in the jig itself, and the jig may be cooled by the coolant. Therefore, the cooling step may be performed when the welding step is performed, or may be performed at another timing.

By further cooling the jig in this way, the heat generated by the welding conducted to the jig can be released to the outside, and the high temperature can be suppressed by repeatedly using the jig. . For this reason, when welding the container of an electrical storage element, it can suppress that a high temperature jig | tool contacts a container and exerts a bad influence on an electrical storage element. Moreover, since it can suppress that a jig | tool deteriorates with a temperature change, the lifetime of a jig | tool can be extended.

Further, in the above embodiment, the jig 300 is formed with the groove portion 330 including both the positive electrode terminal 521 and the negative electrode terminal 522 in a state where the jig 300 is disposed at the predetermined position P2 of the container 510. However, the groove portion 330 is formed. However, the present invention is not limited to this, and two recesses containing each of the positive electrode terminal 521 and the negative electrode terminal 522 may be formed. Further, in addition to the positive electrode terminal 521 and the negative electrode terminal 522, if there is a portion protruding outward from the lid portion of the power storage element, a groove portion or a concave portion for enclosing the portion may be formed.

Further, in the above embodiment, the welding target portion 530 to be welded of the container 510 of the power storage element 500 is a boundary portion between the main body 511 and the lid 512. However, the present invention is not limited to this, and the container is in other parts. In the case of welding, the storage element manufacturing method and storage element manufacturing apparatus of the present invention can be applied to other parts. For example, the present invention can be applied when welding is performed to form the side surface of the container, and can also be applied when welding is performed to form the bottom surface of the container.

Further, in the above embodiment, the four blow-out portions 210 to 240 supply the shielding gas to the four portions 531 to 534 of the welding target portion 530, respectively, so that the atmosphere of the shielding gas is given to the welding target portion 530. Although formed, the shield gas may not be supplied by the four outlets 210 to 240. For example, only the two blowing

parts

210 and 220 may be configured to supply the shielding gas to the two

long side parts

531 and 532 of the welding target part 530. That is, in the welding step, the two welding target portions may be welded while supplying the shielding gas from the two different directions to the two welding target portions corresponding to the two welding target portions.

In the above embodiment, the two

long side portions

531 and 532 of the welding target portion 530 are parallel at a predetermined interval, but may not be parallel as long as they are separated by a predetermined interval. . Moreover, although the welding object part 530 is substantially rectangular shape, not only this but oval shape, elliptical shape, and circular shape may be sufficient.

Moreover, in the said embodiment, it is the structure by which the cover body 512 is arrange | positioned so as to oppose the inner wall surface of the opening of the main body 511, and the welding object part 530 is formed in the upper surface of the container 510, and it is the upper direction (Z-axis direction) However, the welding is not limited to this. For example, the lid may be disposed on the upper end of the main body, and may be applied to a container that is welded by irradiating a laser beam from the horizontal direction (X-axis direction and Y-axis direction). In this case, it is conceivable that the laser beam is scanned from a plurality of directions by providing a plurality of welded portions that irradiate the laser beam on the lateral side of the container. Further, the laser beam scanning method may not be used, and the method can also be applied to a method of welding by moving the laser head that irradiates the laser beam, and welding is performed by moving the pedestal to which the container is fixed. It can also be applied to the method. In addition, if a mirror for reflecting the laser beam irradiated from above in the horizontal direction is provided on the entire side of the lid of the container, the laser beam irradiation method from above in the above embodiment is also possible. realizable.

In the above-described embodiment and its modifications, the wall surfaces A11, A12, A21 to A24 of the

jigs

300 and 300a are inclined with respect to the flow direction of the shield gas, but may not be inclined. In other words, a jig having a wall surface perpendicular to the flow direction of the shield gas may be used as long as the shield gas supplied from different directions can be prevented from joining at the welding target portion.

Further, in the above-described embodiment and the modification thereof, the plurality of blow-out portions 210 to 240 are directed from both sides in the X-axis direction and both sides in the Y-axis direction toward the welding target portion 530 of the container 510 of the power storage element 500. Although the shielding gas is supplied in the direction along the direction or the Y-axis direction, the shielding gas may not be supplied in the direction along the X-axis direction or the Y-axis direction.

For example, the plurality of blow-out portions 210 to 240 supply shield gas from the positions on both sides in the X-axis direction, both sides in the Y-axis direction, and on the plus side in the Z-axis direction (that is, obliquely upward) toward the welding target portion 530. May be. Further, the plurality of blow-out portions 210 to 240 supply shield gas from, for example, both sides in the X-axis direction, both sides in the Y-axis direction, and the negative side in the Z-axis direction (that is, obliquely downward) toward the welding target portion 530. May be.

In addition, two of the plurality of blowing portions 210 to 240 are, for example, two blowing

portions

210 and 220 that are obliquely crossed with respect to the direction in which the

long side portions

531 and 532 of the welding target portion 530 extend (oblique oblique lateral direction). Shielding gas may be supplied. Similarly, the remaining two blowing

portions

230 and 240 of the plurality of blowing portions 210 to 240 are, for example, directions that obliquely intersect with the direction in which the

short side portions

533 and 534 of the welding target portion 530 extend. The shielding gas may be supplied from (obliquely lateral direction).

As described above, even when the blow-out portions 210 to 240 supply the shielding gas from the obliquely upward, obliquely downward, or obliquely lateral directions to the welding target portion 530, the

jigs

300 and 300a are viewed from different directions. It can suppress that the shield gas supplied merges in the welding target part 530.

Moreover, in the said embodiment and its modification, the jig | tool 300,300a is a solid member, However, If it is a member which has a surface on the both sides of a Y-axis direction, it may not be a solid member. And the member in which the two walls which have the wall surface corresponding to each of the two

long side parts

531 and 532 of the welding object part 530 may be formed.

Further, in the above embodiment and its modifications, the

jigs

300 and 300a are configured to cover the positive electrode terminal 521 and the negative electrode terminal 522 of the power storage element 500, but are not limited thereto. For example, in the case of a power storage element 500a including a positive electrode terminal 521a and a negative electrode terminal 522a that occupy a large proportion of the width in the Y-axis direction of the container 510 as in the power storage element 500a shown in FIG. 11, the positive electrode terminal 521a and the negative electrode If the jig is configured to cover the terminal 522a, the jig interferes with the welding target portion 530 and laser welding cannot be performed. Therefore, in order to correspond to the positive electrode terminal 521a and the negative electrode terminal 522a, two groove portions 330b for accommodating the positive electrode terminal 521a and the negative electrode terminal 522a are formed instead of the groove portion 330 formed in the jig 300. Alternatively, a jig 300b having a base 310b may be employed. In this case, the two groove portions 330b have a shape in which both ends are open in the Y-axis direction of the jig 300b. Even in the jig 300b having such a shape, wall surfaces A31 and A32 for shielding the shielding gas are formed on the jig 300b, so that the two flows of the shielding gas have two long side portions 531. 532 can be prevented from joining. FIG. 11 is a perspective view showing the appearance of a state in which the jig according to the modification is disposed at a predetermined position of the power storage element.

In addition, embodiments constructed by arbitrarily combining the constituent elements of the above-described embodiment and its modifications are also included in the scope of the present invention.

The present invention is useful as a method for manufacturing an electricity storage element that can form a stable shield gas atmosphere in a portion to be welded and can reduce the occurrence of poor welding.

10, 10a Manufacturing apparatus 100 Welding part 210,220,230,240 Outlet part 211,221,231,241 Inlet 212,222,232,242 Outlet 300,300a, 300b Jig 310,310b Base 320

Wall

330 , 330b

Groove parts

410, 420, 430, 440

Fixed part

500, 500a Power storage element 510 Container 511 Main body 511a Stepped part 512

Lid

521, 521a

Positive electrode terminal

522, 522a Negative electrode terminal 530

Welding target parts

531, 532

Long side parts

533, 534 Short side portion A11, A12, A21 to A24, A31, A32 Wall surface F11, F12, F21, F22 Shield gas flow P1, P2 Predetermined position

Claims

A method of manufacturing a storage element that performs welding on a container of the storage element,
An arrangement step of arranging a jig having a wall surface formed between two parts to be welded to be welded,
A welding step of welding the two welding target parts while supplying shield gas from the two different directions to the two welding target parts in correspondence with the two welding target parts. .
The method for manufacturing a storage element according to claim 1, wherein in the welding step, the shield gas supplied to the welding target portion flows along an inclined surface that is at least a part of the wall surface.
The method for manufacturing a power storage element according to claim 1, wherein in the arranging step, the jig is arranged in contact with the container.
further,
The manufacturing method of the electrical storage element of any one of Claim 1 to 3 including the cooling step which cools the said jig | tool.
5. The welding step includes welding the two welding target portions by irradiating a laser beam from a predetermined position toward the two welding target portions while changing an irradiation angle. The manufacturing method of the electrical storage element of description.
A storage device manufacturing apparatus for performing welding on a storage device container,
Manufacturing of an electricity storage device comprising two welding target parts to be welded, each having a wall formed between the two welding target parts to which shield gas is supplied from two different directions apparatus.
further,
The electrical storage element manufacturing apparatus according to claim 6, comprising two outlets for supplying shield gas from the two different directions to the two welding target portions.
The power storage device manufacturing apparatus according to claim 6, wherein at least a part of the wall surface is inclined with respect to a direction in which the shield gas flows.
The container includes a main body having a rectangular opening, and a long plate-like lid that closes the opening,
The two welding target portions are two long side portions facing each other in a rectangular annular boundary portion between the main body and the lid body,
The jig is disposed between the two long side portions,
The at least one part of the said wall surface is inclined so that it may distance from the said container, so that it goes to the downstream of the direction where the said shield gas flows with respect to the direction where the said shield gas flows. The manufacturing apparatus of the electrical storage element of description.